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Chukhrovite-(Ce), (Ca3Ce)[AlF6]2(SO4)F·12H2O, from the Tripi mine, Alì, Messina Province, Sicily, Italy: definition of neotype material

Published online by Cambridge University Press:  27 December 2024

Daniela Mauro Open the ORCID record for Daniela Mauro [Opens in a new window] ,
Cristian Biagioni Open the ORCID record for Cristian Biagioni [Opens in a new window] ,
Jiří Sejkora  and
Zdeněk Dolníček Open the ORCID record for Zdeněk Dolníček [Opens in a new window]
Daniela Mauro*
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria, Pisa, Italy Museo di Storia Naturale, Università di Pisa, Via Roma, Calci, Pisa, Italy
Cristian Biagioni
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria, Pisa, Italy Centro per l’Integrazione della Strumentazione scientifica dell’Università di Pisa, Università di Pisa, Italy
Jiří Sejkora
Affiliation:
Department of Mineralogy and Petrology, National Museum, Cirkusová, Prague, Czech Republic
Zdeněk Dolníček
Affiliation:
Department of Mineralogy and Petrology, National Museum, Cirkusová, Prague, Czech Republic
*
Corresponding author: Daniela Mauro; Email: daniela.mauro@unipi.it
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Abstract

Neotype material of chukhrovite-(Ce), ideally (Ca3Ce)[AlF6]2(SO4)F·12H2O, was established on the basis of a new occurrence from the Tripi mine, Alì, Peloritani Mountains, Sicily, Italy. In fact the Russian specimens originally considered as type material of this species were later found to correspond to Ce-rich chukhrovite-(Y). At the Tripi mine, chukhrovite-(Ce) occurs as white cube-octahedral crystals, up to 0.05 mm in size, associated with creedite, quartz and fluorite. Electron microprobe analysis gave (in wt.%, normalised to sum = 100.00): SO3 8.40, P2O5 0.16, ZrO2 0.12, Al2O3 11.95, Y2O3 0.48, La2O3 3.64, Ce2O3 7.63, Pr2O3 1.00, Nd2O3 3.23, Sm2O3 0.97, Eu2O3 0.13, Gd2O3 0.97, Dy2O3 0.21, CaO 20.47, F 22.09, Cl 0.07, O = (F, Cl) –9.31, H2Ocalc 27.80. On the basis of 29 anions per formula unit, assuming the presence of 13 (F+Cl+OH) atoms and 12 H2O groups, the empirical formula of chukhrovite-(Ce) from the Tripi mine is Ca3.17(Ce0.40La0.19Nd0.17Pr0.05Sm0.05Gd0.05Y0.04Eu0.01Dy0.01)Σ0.97Zr0.01Al2.04(S0.91P0.02)Σ0.93O4[F10.10Cl0.02(OH)2.88]Σ13.00·12H2O. The occurrence of H2O groups was supported by micro-Raman spectroscopy. Chukhrovite-(Ce) is cubic, Fd$\bar 3$, with a = 16.7608(5) Å, V = 4708.5(4) Å3 and Z = 8. Its crystal structure was refined to R1 = 0.0378 for 604 unique reflections with Fo > 4σ(Fo) and 36 least-square parameters. Chukhrovite-(Ce) belongs to the chukhrovite group and it is isotypic with chukhrovite-(Y), whereas it is homeotypic with chukhrovite-(Ca).

Keywords

chukhrovite-(Ce)neotypesulfatefluorinecrystal structureRaman spectroscopyPeloritani MountainsSicilyItaly

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Type
Article
Information
Mineralogical Magazine , Volume 89 , Issue 3 , June 2025 , pp. 328 - 335
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.

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Footnotes

Associate Editor: Daniel Atencio

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